Disassembly
12
CVHM-SVN001C-EN
Important:
Any unit pressure must be relieved before
disconnecting refrigerant lines. The units
ship from the factory with a 5 psi dry
nitrogen holding charge.
3. Disconnect the AFD cooling lines at the bottom of the
elbows coming out of the chill plate, both feed and
return. Cap the lines and chill plate elbows to prevent
debris from entering the system.
4. Mark and disconnect the motor power wires at the
drive output terminals and inside motor junction box.
There will be six power wires and two ground wires.
Note:
Always compare the wire connections to the
as-built wiring diagrams to assure the
schematics match the actual connections. Make
notes as necessary to assure the wires are
reconnected to the same locations.
5. Remove wire tray covers and completely remove wires
from wire tray. Disassemble and remove the wire tray
by unbolting the tray at the compressor junction box
and then removing the screws from support bracket on
the AFD cabinet.
6. Mark and disconnect the high pressure cutout switch
wires at the terminal block and pull the cable out of the
AFD cabinet.
7. Mark and disconnect the wires that run between the
drive and the control panel at the drive and pull the
conduit out of the AFD cabinet.
8. Mark and disconnect the oil/refrigerant pump wires
from the terminal block and pull conduit out of the AFD
cabinet.
9. Mark and disconnect drive communication cable at
terminal block and pull the cable out of the AFD
cabinet.
10. Support the weight of the AFD cabinet with a fork truck
or another suitable lifting device (minimum 2-ton rated
capacity).
11. Loosen and remove the bolts that secure the AFD
cabinet to the lower mounting brackets. Unhook the
right side at the L-bracket welded to the condenser, four
bolts total. Unhook the left side at the condenser
support leg, four bolts and nuts total.
12. Carefully lift the AFD cabinet away from the chiller. Do
not bump or jolt the AFD while lifting.
Important:
In cases where the unit is being installed
through restricted spaces, the oil tank filter
may need to be temporarily removed. Prior
to removal of the filter, switch the regulator
to the “change filter” setting. After the filter
has been removed from the regulator block,
the opening must be sealed to ensure no
contaminates are allowed into the system.
Due to the hygroscopic nature of the oil,
install a new filter after the chiller has
passed through the restricted space.
Installation of the AFD cabinet is essentially the reverse of
the removal procedure. All mounting bolts should be
torqued to ANSI standards based on the bolt diameter. The
motor power wires connecting to the drive output
terminals should be torqued according to the label inside
the AFD cabinet. Tighten the power wires that connect to
the AFD terminal block to 8.3 ft-lb (11.3 N-m). The motor
powers wires connecting to the motor terminals inside the
compressor motor junction box shall be torqued between
20–26 ft·lb. Torque the corresponding ground cables
inside the compressor motor junction box to 38 ft·lb. Refer
to the as-built wiring diagrams for connection locations.
Purge Unit Removal
To remove the purge assembly from the top of the
condenser:
1. Isolate the purge unit from the condenser shell by
closing the vapor and liquid line valves.
WARNING
Refrigerant under Positive Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury
or equipment damage. System contains oil and
refrigerant and may be under positive pressure.
Recover refrigerant to relieve pressure before opening
the system. See unit nameplate for refrigerant type. Do
not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives.
WARNING
Refrigerant under Positive Pressure!
Failure to follow instructions below could result in an
explosion which could result in death or serious injury
or equipment damage. System contains oil and
refrigerant and may be under positive pressure.
Recover refrigerant to relieve pressure before opening
the system. See unit nameplate for refrigerant type. Do
not use non-approved refrigerants, refrigerant
substitutes, or refrigerant additives.
WARNING
Hazardous Voltage w/Capacitors!
Disconnect all electric power, including remote
disconnects and discharge all motor start/run
capacitors before servicing. Follow proper lockout/
tagout procedures to ensure the power cannot be
inadvertently energized. Verify with an appropriate
voltmeter that all capacitors have discharged. Failure to
disconnect power and discharge capacitors before
servicing could result in death or serious injury.
For additional information regarding the safe discharge
of capacitors, see PROD-SVB06A-EN
